Permit using arrays to make extending lists easier

[jcpunk]

For the loginctl user parameter lists, it is easier to set them as an array (that way I can append or de-dupe easily).

Psudo hiera:

systemd::logind_settings:
  KillExcludeUsers: 
  - root

systemd::logind_settings:
  KillExcludeUsers: 
  - other_user

[puppet-community-rangefinder]

systemd::logind is a class

that may have no external impact to Forge modules.

This module is declared in 7 of 575 indexed public Puppetfiles.

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[ekohl]

Technically only KillOnlyUsers and KillExcludeUsers can be lists, but for those this is a good improvement. I didn't find other lists that could have a different separator when reading man 5 logind.conf.

[raphink]

That should be fine, considering the type validates these parameters properly.